Another thing that could eventually incentivize the Chargers to move - while their lease is only a dollar a year - they get zero of the non-football revenue of the stadium. Also, a significant amount of revenue for things like luxury boxes, goes to the costs of building the stadium - i.e., basically to Kroenke. The Chargers only get 18.75% of luxury box revenue and of PSLs, for instance.
If they aren't selling tickets, the dollar lease won't actually be a good deal for the Chargers. They will tough it out for a while, but as it is they have not gotten a big boost in team value from the move, and unless they become popular they won't - the deal is set up so that Kroenke's construction costs are substantially being paid down by things like naming rights, psls, jointly sold luxury boxes (likely all of them) etc. So that's money in Kroenke's pocket, and not Spanos'. If Spanos had his own stadium, chances are that would be money in his pocket. Basically, Kroenke set up the deal so it looked generous, but denied the Chargers a lot of sources of revenue - and a lot of that goes to pay off the stadium that Kroenke solely owns. I suspect a bottle or two of champagne were opened by the Rams' negotiators when it was signed.